Roland J Christensen
Land Surveyors in Fayette, UT

6702858, Mar 9, 2004

May 15, 2002

10/147331

Roland J. Christensen - Fayette UT 84630

Roland J. Christensen - Fayette UT

A61F 280

623 37

A socket device of a prosthetic includes a liner with a variable viscosity fluid disposed between the socket and the users stump. The variably viscosity fluid varies the softness or stiffness of socket. In addition, the variable viscosity fluid conforms to the contours of the users stump for a more customized fit. The variable viscosity fluid can include a shear stiffening material that increases in viscosity as a load or strain, or rate of loading or rate of strain, applied, or a magneto or electro rheologic fluid responsive to a magnetic or electric field.

6805717, Oct 19, 2004

Oct 8, 2002

10/268015

Roland J. Christensen - Fayette UT

Roland J. Christensen, as operating Manager of RJC Development, LC, General Manager of the Roland J. Christensen Family Limited Partnership - Fayette UT

A61F 266

623 52, 623 47

A prosthetic foot device includes an ankle section with a discrete, straight section in a substantially vertical orientation with a curved section on both sides. An attachment member can be coupled to a limb of an amputee. An elongated forefoot portion can have an upper attachment section attached to the attachment member, and can extend downwardly through the ankle section positioned at an ankle location of a natural foot, and forwardly through an arch section, to a toe section positioned at a toe location of a natural foot. The first curved section can interconnect the attachment section and the straight section, while the second curved section can interconnect the straight section and the arch section.

6120547, Sep 19, 2000

Nov 6, 1998

9/188018

Roland J. Christensen - Fayette UT

A61F 266

623 52

A device for joining a prosthetic appendage to a prosthetic limb, comprising rotatable bearings encased within a cylindrical sleeve of resilient material, the cylindrical sleeve having its long axis colinear to the axis of rotation of the bearings. The bearings have a proximal portion affixed to the end of the limb, and a distal portion affixed to the appendage at the point where it is to be joined. The resilient sleeve comprises a top portion which is affixed to the outside surface of the proximal portion of the bearings, a bottom portion which is affixed to the outside surface of the distal portion of the bearings, and a typically bulging central portion which is not affixed to any part of the bearings. When the appendage is rotated relative to the limb about the axis of the bearings, such rotation is resiliently resisted by torsional flexure of the central portion of the resilient sleeve.

5944760, Aug 31, 1999

Aug 4, 1997

8/906287

Roland Christensen - Fayette UT

Roland J. Christensen Family Limited Partnership - Fayette UT

A61F 266

623 55

A prosthetic foot, having a forefoot member and a heel member, is comprised of two separate members forming opposite halves of the foot generally about the longitudinal axis of the foot for simulating natural rotation of the toes of a real foot. The forefoot member of the foot forms a resilient arc extending from a fixture member to a toe position and has an attachment portion, a curvilinear spring portion, an arch portion, and a toe portion. The heel member extends between the forefoot member and a heel position and has an attachment portion and a heel portion. The heel member is preferably attached to the forefoot member by wrapping the members with a resin impregnated fibre. The foot preferably has a mating member such as a rib-and-groove type connection between the forefoot and heel members for preventing the forefoot and heel portions from sliding and rotating with respect to each other and thus prevents shear stress from being placed on the fibers holding the members together. The foot has a fixture member for attachment to a socket for receiving a stump of an amputee and may include an angle adjustment mechanism for adjusting the angle of the foot members with respect to the ground. The foot may include a secondary heel member in addition to the heel member, or primary heel member for supporting the primary heel member.

5657568, Aug 19, 1997

Dec 18, 1995

8/573693

Roland J. Christensen - Fayette UT

F41A 2100

42 7602

A composite/metallic gun barrel is disclosed having a metallic liner and alternating first and second groups of fibers wrapped about the liner, the first groups being disposed in a first orientation generally perpendicular to the long axis of the liner, and the second groups including one or more layers disposed generally parallel with the long axis of the metallic liner. By controlling the amount of fibers in each group relative to the other group, the coefficients of thermal expansion in the radial direction can be regulated to provide a gun barrel having desired firing characteristics.

7462201, Dec 9, 2008

Oct 20, 2004

10/970679

Roland J. Christensen - Fayette UT, US

Freedom Innovations, LLC - Irvin CA

A61F 2/64

623 47

A prosthetic foot with an adjustable ankle includes an upper portion coupled to a socket of an amputee. A lower portion is adjustably coupled to the upper portion, and is attached to a foot member with heel and toe sections. A movable coupling is disposed between the upper and lower portions, and includes a displacement member slidably coupled to a displacement track. The movable coupling allows the toe section to pivot downward and the heel section to simultaneously displace forward. The adjustable ankle can be adjusted with a motor coupled to a tractor bolt coupled between the upper and lower portions. A level sensor can sense the orientation of the upper portion and send a signal to operate the motor to vertically orient the upper portion or level the foot.

8034121, Oct 11, 2011

Apr 17, 2009

12/425876

Roland J. Christensen - Fayette UT, US

Freedom Innovations, LLC - Irvine CA

A61F 2/66

623 55, 623 53

A prosthetic foot includes a pair of elongated forefoot leaf springs with proximal ends coupled to an attachment member and extending in an arc to distal ends with the forefoot leaf springs being oriented with one over another. The pair of forefoot leaf springs has different lengths and is coupled to one another at the proximal and distal ends defining an open, uninterrupted gap between the forefoot leaf springs. A pair of hinge connections can be disposed each at a different one of the proximal and distal ends of the pair of elongated forefoot leaf springs. The pair of forefoot leaf springs together has a non-linear force deflection under loading during gait.

6241776, Jun 5, 2001

Jul 7, 1999

9/348431

Roland J. Christensen - Fayette UT

A61F 266

623 52

A prosthetic foot has a forefoot reinforcement member extending from an attachment section, through a curvilinear spring and arch section, to a toe end. A forefoot reinforcement member extends from the arch section above the forefoot member to a free end proximal the attachment section, and within an extreme range of movement of the forefoot member. A heel member may extend from the arch section to a heel end. A heel reinforcement member may extend from the arch section under the forefoot member to a free end proximal the attachment section, and within an extreme range of movement of the forefoot member. A secondary forefoot reinforcement member may extend from the arch section to a free end proximal the toe end.

7520904, Apr 21, 2009

Oct 19, 2005

11/254621

Roland J. Christensen - Fayette UT, US

Freedom Innovations, LLC - Irvine CA

A61F 2/64, A61F 2/48

623 47, 623 24

A prosthetic foot with an adjustable ankle includes an upper portion coupled to a socket of an amputee. A lower portion is adjustably coupled to the upper portion, and is attached to a foot member with heel and toe sections. A movable coupling is disposed between the upper and lower portions, and includes a displacement member slidably coupled to a displacement track. The movable coupling allows the toe section to pivot downward and the heel section to simultaneously displace forward. The adjustable ankle can be adjusted with an actuator coupled to a tractor bolt coupled between the upper and lower portions. A sensor is associated with the upper portion or the lower portion to sense frequency of contact, force of contact, or orientation of the upper portion or the lower portion, and to output a corresponding output signal.

4934917, Jun 19, 1990

Mar 7, 1988

7/164521

Larry Ashton - Provo UT
Roland J. Christensen - Fayette UT
Randy L. Crane - West Jordan UT

Fiber Technology Corporation - Provo UT

A01J 2100

425101

A process is disclosed for forming a thermoplastic structure on the exterior surface of the heated mold form. A mold is heated to approximately two times the melting temperature of a thermoplastic material and particulate thermoplastic material then sprinkled onto the exterior surface of the heated mold. An adhesively bondable material may then be added to the semi-molten thermoplastic material structure. The mold is then cooled and the resulting thermoplastic structure removed. An apparatus for practicing the above process comprising a mold form, heating system, and particulate thermoplastic material dispensing system is also disclosed.